DataSheet.es    


PDF CH8438 Data sheet ( Hoja de datos )

Número de pieza CH8438
Descripción Video Multiplexer
Fabricantes Chrontel 
Logotipo Chrontel Logotipo



Hay una vista previa y un enlace de descarga de CH8438 (archivo pdf) en la parte inferior de esta página.


Total 11 Páginas

No Preview Available ! CH8438 Hoja de datos, Descripción, Manual

CHRONTEL
Video Multiplexer with Source Control
CH8438
Preliminary
Features
• Triple 8-bit DAC and buffers support 1280 x 1024
display resolution
• High-speed multiplexing between digital
and analog RGB signals
• 24-bit digital RGB interface supports up to
16.7 million colors
• Supports CCIR601 4:2:2 YCrCb input formats
• Built in YUV-to-RGB color space conversion
• Analog auxiliary inputs with programmable
input attenuation
• 2’s complement input capability on Red and Blue
channels, supporting 4:4:4 YUV format with analog
YUV outputs
• Programmable brightness, contrast, and hue
attributes for the digital input signals
• Programmable switching delay
• Two-wire serial programming
• Enhanced replacement of STV8438
• CMOS technology in 44-pin PQFP
• 5V supply
Description
Chrontel’s CH8438 combines a 24-bit digital video
interface, YUV to RGB converter, three 8-bit DACs, a
high-speed analog multiplexer, an analog input
attenuator, and three video buffers in one integrated
circuit.
The CH8438’s high-speed analog multiplexer allows
simultaneous display of video (digital RGB) with
graphics (analog RGB), making CH8438 ideal for
video games, editing, PC video, and for applications
requiring picture-in-picture capability.
CH8438 provides a 24-bit digital pixel bus interface,
which supports RGB, 4:4:4 YUV and 4:2:2 YCrCb
input formats. With the 4:2:2 YCrCb input format, a
built-in color space converter translates YUV video
information to RGB before muxing with the analog
graphics input, while the 4:4:4 YUV format accepts 2’s
complement Red and Blue data, and provides analog
YUV outputs.
CH8438 has seven 4-bit control registers which are
programmable with the serial interface pins. The
programmable functions include digital input formats;
video attributes of contrast, hue, and brightness; analog
input attenuation; and switching delay.
RAUX
GAUX
BAUX
CLK
DVDD
AVDD
0
ROUT
P[23:0]
24
0
GOUT
0
BOUT
R/C
SD
SC
COM
Rev. 1.0, 8/28/97
SERIAL I/F
12 2 3
3
8-TAP DELAY LINE
DGND
AGND
Figure 1: CH8438 Block Diagram
1

1 page




CH8438 pdf
Preliminary
CH8438
Digital Input Format
CH8438 supports six different digital input formats (modes) summarized in Table 3 below. The six modes
include 24-bit True-Color RGB format (RGB output), 4:4:4 YCrCb format (YUV output) and four 4:2:2
YCrCb formats (with color space conversion to provide RGB output).
Table 3 • Mode Table
MODE
0
FORMAT Register R6 (DIF[3:0])
RGB
0000
R/C
1
Number of Pipeline Clock Cycles
0
1 4:4:4
0000
0001
0
X
0
2 4:2:2
0010
HREF
5
3 4:2:2
0011
HREF
5
4 4:2:2
0100
HREF
5
5 4:2:2
0101
HREF
5
Note: † See Figure 7 on page 18 for an example of the on-chip DAC inputs transition after five pipeline clock cycles
The function of pin R/C changes in modes 2 5, becoming the input pin for the signal HREF. In modes 2 5,
HREF and P[23:0] are clocked by the rising edge of CLK. When HREF (pin R/C) is set high, the rising edge
of CLK clocks in the first 16 bits [Y0 and U0(Cb)] of the YUV 4:2:2 data. The output is blanked when
HREF = 0 is clocked in. For more detailed information, please refer to Figure 9 on page 19.
In mode 1, the U-data path is identical to the V-data path, therefore, P[23:16] can be used as the “V” inputs and
P[7:0] can be used as the “U” inputs, as shown in Table 4 below.
Table 4 • Pixel Data Organization
MODE
P[23:16]
P[15:8]
P[7:0]
P23 P22 P21 P20 P19 P18 P17 P16 P15 P14 P13 P12 P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1 P0
0 B7 B6 B5 B4 B3 B2 B1 B0 G7 G6 G5 G4 G3 G2 G1 G0 R7 R6 R5 R4 R3 R2 R1 R0
1 U7 U6 U5 U4 U3 U2 U1 U0 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 V7 V6 V5 V4 V3 V2 V1 V0
2 Y7 Y6 Y5 Y4 Y3
Y2 Y1 Y0 C7 C6 C5
C4 C3 C2 C1 C0
3 C7 C6 C5 C4 C3
C2 C1 C0 Y7 Y6 Y5
Y4 Y3 Y2 Y1 Y0
4 C4 C3 C2 C1 C0
Y7 Y1 Y0 C7 C6 C5
Y6 Y5 Y4 Y3 Y2
5 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 C7 C6 C5 C4 C3 C2 C1 C0
Rev. 1.0, 8/28/97
9

5 Page





CH8438 arduino
Preliminary
CH8438
Part number
CH8438-QA
CH8438-QB
ORDERING INFORMATION
Package type
Number of pins
PQFP 10 x 10 mm
44
PQFP 14 x 14 mm
44
Voltage supply
5V
5V
Note: For new designs, use the 10 x 10 mm package part. The 14 x 14 mm package will be phased out.
Chrontel
2210 O’Toole Avenue
San Jose, CA 95131-1326
Tel: (408) 383-9328
Fax: (408) 383-9338
http://www.chrontel.com
©1997 Chrontel, Inc. All Rights Reserved.
Chrontel PRODUCTS ARE NOT AUTHORIZED FOR AND SHOULD NOT BE USED WITHIN LIFE SUPPORT SYSTEMS OR NUCLEAR FACILITY APPLICATIONS WITHOUT THE
SPECIFIC WRITTEN CONSENT OF Chrontel. Life support systems are those intended to support or sustain life and whose failure to perform when used as directed can reasonably
expect to result in personal injury or death. Chrontel reserves the right to make changes at any time without notice to improve and supply the best possible product and is not
responsible and does not assume any liability for misapplication or use outside the limits specified in this document. We provide no warranty for the use of our products and assume no
liability for errors contained in this document. Printed in the U.S.A.
Rev. 1.0, 8/28/97
21

11 Page







PáginasTotal 11 Páginas
PDF Descargar[ Datasheet CH8438.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
CH8438Video MultiplexerChrontel
Chrontel

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar